JWT Encoder
Build and sign JWT tokens with HS256 using browser-native Web Crypto APIs.
Runs entirely in your browser — nothing is uploaded or stored on any server.
About JWT Encoder
Updated Jan 2025The JWT Encoder lets you construct a JSON Web Token by specifying the header algorithm, payload claims, and a signing secret. It uses the browser's native Web Crypto API to sign with HS256, producing a valid JWT that can be used for testing authentication flows, building demos, or learning how JWTs work.